By Ron Gilster

ISBN-10: 0764541870

ISBN-13: 9780764541872

Prepping for the A+ certification examination isn't really a simple problem, yet on the way to turn into a professional machine technician, passing this try is a demand. the good news is you just need to take it as soon as on your lifestyles to develop into certified.A+ Certification For Dummies third version is a no-nonsense, easy-to-use reference and learn consultant for the A+ center examination and the OS applied sciences examination! It specializes in every thing you want to recognize to go those checks, delivering historical past details that can assist you comprehend a number of the extra complicated options and applied sciences. You’ll have a deal with on the entire matters, including:The anatomy of a computerBuilding and deconstructing a PCMaintaining a computerOperating structures basicsProfiles of home windows ninety five, ninety eight, Me, 2000, and XPMaking community connectionsWorking with the networkSharing the internetThe bonus CD-ROM beneficial properties unique test-prep software program with two times as many pattern questions than the former variants of this e-book, plus demo types of Boson software program, Inc., JRK software program, Vista-Net Publishing, and Self attempt software program. Now improved to incorporate the 2003 model of the examination, this is often the fun-and-easy option to examine for the examination, with all of the rewards in part the time!

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Example text

The PC uses DC power. The PC’s power supply converts power from the AC wall outlet into DC power for the computer. Peripheral devices, such as printers, external modems, and storage drives (including CD-ROM and Zip drives), use an AC power converter to convert AC power into DC power. Okay, so the computer runs on direct current electricity. What does this fact have to do with the A+ exam? 3 volts, minus 5 volts, plus 5 volts, minus 12 volts, and plus 12 volts are DC power levels produced by the power supply.

0 0 0 Subtract 32768 (215) from your original number. The difference in this example is 30761. Repeating the process used in Step 1, the highest value that can now be subtracted from 30761 is 214 or 16384. The binary number is now 1100000000000000. Continuing this process through each remaining value of the original decimal number and for each digit in the binary number, the final binary number for this example is 1111100000101001. Being able to convert decimal numbers to binary is a good skill for a PC repair technician.

A wide variety of shapes, sizes, and types of motherboards are available. Regardless of a PC’s age and its form factor (see “Motherboard form factors,” later in the chapter), at least one manufacturer probably produces a motherboard to fit it. Manufacturers attempt to set their motherboards apart from the others and increase their value by incorporating more or fewer controllers, expansion buses, processor sockets, external connectors, and memory slots. For consumers, a wide range of motherboards with a deep list of features is available to fit into an even wider range of PCs.

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A+ Certification for Dummies, 3rd edition by Ron Gilster

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